33. Detect Circular Pattern Match

#include <stdio.h>
#include <stdint.h>

uint8_t is_circular_match(uint16_t reg, uint16_t target) 
{
    uint32_t double_pattern = (((uint32_t)reg << 16) | reg);
    uint16_t res = 0;
    for (size_t i = 0; i < 16; ++i)
    {
        uint16_t curr_window = (double_pattern >> i) & 0xFFFF;
        res |= (curr_window == target);
    }
    return (uint8_t)res;
}

int main() {
    uint16_t reg, target;
    scanf("%hu %hu", &reg, &target);
    printf("%hhu", is_circular_match(reg, target));
    return 0;
}